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Measurement of the Λb polarization and angular parameters in Λb →j /ψ Λ decays from pp collisions at s =7 and 8 TeV MEASUREMENT of the Λb POLARIZATION ⋯ A. M. SIRUNYAN et al.

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Authors

Sirunyan, A. M.

Tumasyan, A.

Adam, W.

Ambrogi, F.

Asilar, E.

Bergauer, T.

Brandstetter, J.

Brondolin, E.

Dragicevic, M.

Erö, J.

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American Physical Society (APS)

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Article

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Abstract

An analysis of the bottom baryon decay Λb→J/ψ(→μ+μ-)Λ(→pπ-) is performed to measure the Λb polarization and three angular parameters in data from pp collisions at s=7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Λb polarization is measured to be 0.00±0.06(stat)±0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14±0.14(stat)±0.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.

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English

Citation

Physical Review D, v. 97, n. 7, 2018.

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São Paulo, Instituto de Física Teórica - IFT
IFT
Campus: São Paulo

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